Inflation and Real Returns: The Growth You Actually Keep

Inflation is the silent factor in financial planning. Even if your account balance grows, your purchasing power may grow much less, or not at all, depending on how prices change.

Nominal vs real: the key distinction

Nominal return is what you see on statements. Real return adjusts for inflation: it’s the growth in purchasing power. If you earn 7% but inflation is 4%, your real return is closer to ~3%.

Why inflation matters more over long horizons

Small differences compound. Planning a goal twenty years out with a nominal assumption can overstate what your future balance can buy. That can lead to saving too little or delayed retirement planning.

How to plan with inflation

• Use a conservative return assumption and an explicit inflation assumption.
• Model multiple scenarios (low/medium/high inflation).
• Keep your savings rate flexible; increase contributions when possible.

Model nominal growth, then check it against real rates

You can project nominal account balances with the Compound Interest Calculator, then rerun using a reduced ‘real’ rate (nominal minus inflation). For recurring investing, use the SIP Calculator and compare outcomes under different return assumptions.

Takeaway

The point isn’t to predict inflation perfectly; it’s to avoid building a plan that only works in a world of low inflation. Use ranges, review periodically, and prioritize consistency.